07-08-2016
I was a bit sceptical when I saw your file name samples like home/user/... guessing it should be /home/user.... That's where the "additional" level came from.
find traverses the directory tree starting at the given dir looking for regular files (-type f) and all files matching the pattern given, printing the full path to stdout. For further details see man find.
stdout is piped into a shell while loop that reads the full file name into the FN variable. TMP is another temporary shell variable that is assigned from FN using shell's parameter expansion (see e.g. man bash). # removes shortest matching prefix pattern, %% removes longest matching suffix pattern. /.../... does pattern substitution.
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LEARN ABOUT OPENDARWIN
chdir
CHDIR(2) BSD System Calls Manual CHDIR(2)
NAME
chdir, fchdir -- change current working directory
SYNOPSIS
#include <unistd.h>
int
chdir(const char *path);
int
fchdir(int fd);
DESCRIPTION
The path argument points to the pathname of a directory. The chdir() function causes the named directory to become the current working
directory, that is, the starting point for path searches of pathnames not beginning with a slash, '/'.
The fchdir() function causes the directory referenced by fd to become the current working directory, the starting point for path searches of
pathnames not beginning with a slash, '/'.
In order for a directory to become the current directory, a process must have execute (search) access to the directory.
RETURN VALUES
Upon successful completion, a value of 0 is returned. Otherwise, a value of -1 is returned and errno is set to indicate the error.
ERRORS
Chdir() will fail and the current working directory will be unchanged if one or more of the following are true:
[ENOTDIR] A component of the path prefix is not a directory.
[ENAMETOOLONG] A component of a pathname exceeded {NAME_MAX} characters, or an entire path name exceeded {PATH_MAX} characters.
[ENOENT] The named directory does not exist.
[ELOOP] Too many symbolic links were encountered in translating the pathname.
[EACCES] Search permission is denied for any component of the path name.
[EFAULT] Path points outside the process's allocated address space.
[EIO] An I/O error occurred while reading from or writing to the file system.
Fchdir() will fail and the current working directory will be unchanged if one or more of the following are true:
[EACCES] Search permission is denied for the directory referenced by the file descriptor.
[ENOTDIR] The file descriptor does not reference a directory.
[EBADF] The argument fd is not a valid file descriptor.
SEE ALSO
chroot(2)
STANDARDS
The chdir() is expected to conform to IEEE Std 1003.1-1988 (``POSIX.1'').
HISTORY
The fchdir() function call appeared in 4.2BSD.
4th Berkeley Distribution December 11, 1993 4th Berkeley Distribution